a = True
b = 3
c = a+b
e = False

print(type(a))
print(type(b))
print(type(c))
print(c)
print(a+e)
print(a)
print(e)

print("空的字符串" , bool(""))
print("空的列表" , bool([]))
print("空的元组" , bool(()))
print("空的字典" , bool({}))
print("空的集合" , bool(set()))
print("0" , bool(0))
print("0.0" , bool(0.0))

f = 100>200 and 50<(3/0) # 短路的问题可以提高我们的效率
print(f)